For treatment of intestinal worms, mostly mites, some lice, also include mange. The medicine isn’t effective within the elimination of ticks, flies, flukes, or fleas. Because the eggs & larvae on the floor will mature and come back to the host.Effective against larval heartworms, but not for adult heartworms, though it may shorten their lifespan. The dose of the drugs must be very accurately measured, thanks to it’s highly toxic in over-dosage.